| Commercially available plastic LED spinning tops consist of one or more LEDs powered from two button cells and activated using a switch actu...
More about LED (745)
| We use a 6 V lead-acid battery as our source of energy, and a Luxeon 3 W LED as our light source. VCC therefore lies between a minimum of ar...
| This simple LED tester consists of a current source with a potentiometer that can be used to adjust the current. The current source is imple...
| As we all know, LEDs are dimmed by altering the current flowing through them, not the voltage. We achieve this effect in this circuit by usi...
| In our November 2007 edition we posed you the question, how can one power a notebook computer for half an hour without batteries or a mains...
| On the cover of an old copy of Elektor in large print it states: ‘Equipment is only as good as its power supply’. Even though that particula...
| LEDs are used everywhere these days, not just as on/off indicators any more but now also as a source of light. Before you mount an LED in yo...
| Projectors aren’t very expensive to buy and can be modified to produce a large display in the home. Point it at a white wall or projector sc...
| The circuit described here, called ‘LEDBUS’ allows a practically unlimited number of LEDs to be controlled and up to ten lighting programs c...
| LEDs are all the rage lately and the high-power blue and white ones in particular even appeal to unexpected audiences like youths of the msn...